Amoi have confirmed they are currently rolling out Android 4.1.1 for the N820. This is the first MT6577 device that we have heard is getting Android 4.1.1.
The Amoi N820 features a 4.5" QHD IPS-LCD display, 1GB RAM and 4GB ROM with microSD expansion. It has a 3.0MP front facing camera plus an 8.0MP rear camera. The N820 can shoot 720p 1280x720 HD Video and also comes with a 2050mAh battery. It is also (as with most of these MT65x7 phones) a dual SIM device.
The last Amoi I owned was the Three UK branded MOS 1 Ministry of Sound phone, circa 2005, it was a very well built device!
With this update in mind, if I was in the market for an MT6577 device, this is the one I would choose. The update is not available on Amoi's websiteas yet, so it looks like it will be an OTA (Over the air) update.
Aaronight's preferred Aliexpress seller stocks the N820 for $199 in black, FastCardTech offer it for $195 before shipping in black, white, and the funky black-orange combo. This works out to be around £124 before shipping and import fees, which is a bargain price for a Jellybean device.